JPS6039761B2 - Melt spinning method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for melt-weaving polyester or polyamide yarn at high speed, and its purpose is to obtain a high-quality yarn with excellent uniformity as a package with a good winding shape. The present invention provides a method.

First, to describe the general method of molten bottle yarn, as shown in Fig. 1, the melt-spun yarn Y is blown from the nozzle 1 directly below by the blowing device 2. The filaments are passed through a cylindrical spinning cell 3 to avoid the effects of turbulent airflow so that the filaments do not come into contact with each other, and also to prevent the filaments from swinging. A suitable finishing agent is then applied by the finishing agent applying device 4, and the package is taken up at a constant speed by godet rollers 5a and 5b and wound into a package by a winder.

In this method, the melt-spun yarn is sufficiently cooled, applied with a finishing agent, and then wound into a package, so the effective length from the spinneret surface to the spraying device, through the spinning cell, and to the finishing agent applying device is shortened. 4 to 7, during which time it was considered essential that the filaments remain unsupported and not in contact with each other.

As a result, the traveling yarn becomes extremely unstable due to the shaking of the yarn due to external airflow, the influence of accompanying airflow in the yarn cell, fluctuations in indoor temperature and humidity, and other various resistances between the yarn and the air. He believed that this was one of the major causes of yarn unevenness, and that the key to spinning technology was how to control these yarn fluctuations to the maximum extent possible. It is known that the above conventional methods are suitable for producing yarn with stable yarn performance when the yarn cutting speed is relatively slow, for example, at a speed of 1600 m/mjn or less.

However, when performing grade yarn experiments at higher speeds in the range of 1,600 to 5,000/min, the above method resulted in significant disturbance and oscillation of the yarn hemmed from the spinneret, resulting in uneven grade of the yarn. It was found that filament breakage, loop fuzz, strong elongation and elongation spots, and dyeing spots occurred, and problems such as loops, twill irregularities, and twill coming off of the rolled package were found to occur, especially in the winding appearance of the package. . Next, these yarns are subjected to drawing or elongation, simultaneous treatment or drawing of preliminary combustion, and continuous treatment of preliminary combustion (so-called DTY), but during this process, yarn breakage, single yarn breakage, or loop wings frequently occur. Furthermore, we have experienced that there are cases where dyeing spots become a problem and continuous industrial operations have to be discontinued. As a solution to these problems, a method has been proposed in which the filaments constituting the paper yarn are made entangled with each other by air flow and then wound into a package, thereby making the subsequent handling easier. ing.

However, even if such a technique is applied, it has been experienced that the above-mentioned problem of continuous industrial operation is not essentially solved when the paper yarn speed increases. The performance, yarn unevenness, operability, and workability of the resulting yarn are affected by the position of the entangling device, but in this method, the entangling device does not damage the properties of the yarn that has just been spun. A relaxation zone of the yarn is provided, for example between codet rollers. This device is effective when used with only one thread, but if two or more threads are to be run between a pair of godet rollers, the threads must be parallel to each other to the extent that they do not overlap. Therefore, it is difficult to install multiple units of interlacing devices in parallel. Therefore, multi-filament weaving becomes impossible and costs increase. Although it is conceivable to provide another entangling device just before the godet roller, it is not preferred for the same reason as above. Also, if an interlacing device is provided between the final godet roller and the winder, this problem will not occur, but it will become easier to wind around the godet roller.
In particular, the number of failures in switching can become extremely high, leading to situations where operations cannot be continued. The present inventor has devised a method to solve these problems.As a result of extensive research, the present inventors have found a method that allows the entanglement process to be performed at a position so close to the nozzle surface that it was previously thought to be unreasonable, and that can stably obtain high-quality yarn. He came to invent this.

That is, the present invention can remove polyester or polyamide at a thread removal rate of 1
When melting paper yarn at a high speed of 600 min/min or more,
The distance from the cap surface to the thread spun from the cap is greater than the minimum distance sufficient to prevent the filaments constituting the thread from fusing with each other at the initial support point, and within 3 skins. A finishing agent of 0.1 to 0.2% based on the weight of the fiber is applied by the first finishing agent-applying device installed in the range of ~1 stitch/skin intertwining is applied, and after passing through the thread cells, a finishing agent is further applied by a second finishing agent applying device to give a final finishing agent adhesion amount of 0.3 to 0.5
% and none, 0. The method is characterized in that the yarn is wound into a package at a winding tension of ~0.33 mm/d.

In the present invention, the position of the first finishing agent applying device is extremely important because it applies a finishing agent to the twilled yarn and also serves as a support point with which the twilled yarn comes into contact for the first time.

The distance from the mouth surface of the device must be greater than the minimum distance sufficient to prevent the filaments constituting the shark thread from fusing with each other at the initial support point, and within a range of 3. be. It is preferable that this position be as close to the cap as possible, but if it is too close to the cap, the filaments may fuse to each other, cooling may be insufficient, and even thread spots may occur due to cooling spots or thinning spots. On the other hand 3
Exceeding this is not preferable because the yarn will sway significantly. The minimum distance between the mouth surface and the device is determined by the yarn weave, paper yarn speed, etc. For example, in the case of a single yarn weave of 1 denier, satisfactory results can be obtained even if the weave is shortened to about 30 to 50 degrees. The first finish application device is usually installed below the cooling gas blowing device. Incidentally, if a filament with a very fine single yarn weave is cooled in the air without actively cooling the yarn, the blowing of cooling gas can be omitted. This finishing agent is applied to prevent trouble in the subsequent entangling process, but it is important to uniformly apply a very small amount of the finishing agent, 0.1 to 0.2% by weight based on the fiber weight. is necessary.

If it is less than 0.1%, loops may occur or white powder may become noticeable, which is not favorable for operation.

On the other hand, if it is applied in an amount exceeding 0.2%, the finishing agent may scatter or form loops at parts of the filament yarn such as the entangling treatment device and subsequent guides, and white powder may become noticeable, which is unfavorable for operation. The finish is typically used as a 2-1% cloud weight solution. A preferred means for uniformly applying the finishing agent to the spun yarn is, for example, as shown in FIG. can be mentioned.

In such a device, on the surface of the first roller, the finishing agent is uniformly applied to each filament while the filaments are separated, and on the surface of the second loaf, the finishing agent is applied with the filaments being concentrated. . Any other means that can uniformly apply a small amount of finishing agent may be used. The yarn treated in the first finishing agent applying device is then entangled in an entangling treatment device by a gas flow such as air, and the degree of entanglement is 1 to 1 hard/textured, preferably 1 to 1.
It is necessary to make it within the range of 5 pieces/skin. If the degree of entanglement is less than 1 piece/enemy, the entanglement effect is small, resulting in disordered twill and loops on the side edges of the final wound package, resulting in frequent unraveling problems and thread breakage, which significantly reduces operability. This may cause quality defects such as fuzz and loops. On the other hand, if the degree of entanglement exceeds 1 hardness/m, the filaments are likely to be damaged, causing problems such as fluffing, abnormal dyeability, and decreased strength and elongation, and yarn breakage becomes noticeable, which is not preferable. In the present invention, the degree of entanglement is determined as follows.

m First, a tension load of 0.2/d is applied to approximately 100 arcs of yarn.

{21 The yarn is divided into two sections directly below the upper fixed end, and a hook load of grams equivalent to the single yarn denier is applied.

'31 Support the load until the load of the hook is supported by the thread, and drop the hook at a falling speed of 1 to 2 k/sec.

At the point where the hook's load is first supported by the thread, the load support is released, the hook is allowed to fall, and the point where the hook's load is secondly supported by the thread is determined. Let Ln be the distance between the point at which the load of the hook is supported for the first time and the point at which it is supported for the second time. '4) Repeat the operations {1} to {3} for 29 yarns, and take the average value of the measured values as L.

{5] Degree of confounding = rich o The entangled yarn is then passed through a spinning cell.

Since the yarn is brought into a concentrated state by the interlacing process, air resistance, which is a particular problem in high-speed paper yarn, is reduced and the yarn passes stably through the grade yarn cells. The yarn, which has been internally stabilized through the thread extraction cell, is again given a finishing agent by the second finishing agent applying device, but here the final finishing agent is 0.
It is necessary to finish the structure so that it is 3 to 0.5%. If the final coating amount of the finishing agent is less than 0.3%, white powder or fuzz will occur, while if it exceeds 0.5%, the finishing agent may scatter or cause problems during heat treatment processes such as stretching and plate burning. Stalled heaters become a problem, making it impossible to continue stable operation. Finally, the yarn to which the finishing agent has been applied is taken up at a constant speed by a godet roller and wound up by a winding machine.

At this time, in order to obtain a package with a good winding appearance and no defects, the winding tension is preferably 0.08 to 0.33 mm/d.
It is necessary to maintain the temperature between 0.8 and 0.21 m/d. 0.0
If it is less than 8 tan/d, the package will be too soft and the winding layer will easily collapse, which is undesirable.On the other hand, if it exceeds 0.33 tan/d, the side edges of the package will be extremely hard and the edges will be high, resulting in a good package. is not obtained.

Furthermore, the yarn to which the finishing agent has been applied can be directly wound onto a winding machine without passing through a godets trough.

In the conventional method, since the filaments run through the warp cells in a separated state, the thread sways due to disturbance airflow, and the running tension of the thread is high due to the large amount of accompanying airflow, making it difficult to wind the thread without passing through a godet roller. Met. If the godet rollers were omitted, the twill of the package edge height and side end surface would frequently come off, making it impossible to obtain a package that could be put to practical use. However, in the present invention, the yarn after passing through the first finishing agent applying device and the entangling treatment device runs in a condensed state, and the accompanying airflow is extremely reduced while the yarn is prevented from swinging due to disturbance airflow. The running tension can be reduced to, for example, about half that of the secondary method, and a method of winding without passing through a godet roller can be easily adopted. In this case as well, it is necessary to maintain the winding tension at 0.33 t/d or less, preferably 0.21 t/d or less. If it is higher than this, the same drawbacks as the above-mentioned conventional method tend to occur. In this case, it is preferable that the distance between the second finishing agent applying device and the winding machine be at least four times the distance during the traverse of the winding machine. If this distance is longer than this, thread spots may be more likely to occur. Next, the method of the present invention will be specifically explained with reference to the drawings.

Fig. 2 is a schematic side view showing one embodiment of the present invention, Fig. 3 is a partially enlarged view of Fig. 2, in which a is a front view, b is a side view, and c and d are partially enlarged views of the entanglement processing device It is a diagram.

FIG. 4 is a schematic side view showing another embodiment. In FIG. 2, the yarn Y melt-spun from the spinneret 1 is blown with cooling air on one side or around it (on one side in FIG. 2) from the blowing device 2 directly below it.

The first finishing agent applying device 4-1 is provided at a distance from the mouth surface that is greater than and within 3 times the minimum distance sufficient to prevent the filaments constituting the yarn from fusing with each other. As shown in FIG.
It has oiling rollers OR, , OR2 and a zigzumi-shaped collecting guide G, and is provided so that the distance between the mouthpiece surface and OR, which is the first support point, is as short as possible within the above range. The yarn Y is applied with a finishing agent of 0.1 to 0.2% by the oiling rollers OR and OR2, and then entangled by an air flow in the entangled treatment device IL' immediately below the finishing agent. The filaments are sufficiently concentrated by the entangling process, and after passing through the paper yarn cell 3, the final coating amount of the finishing agent is 0.3 in the second finishing agent applying device 4-2 having one oiling roller. -0.5%. The finished yarn Y is moved to godet rollers 5a, 5
b at a constant speed, and wound into a package by winders 6a and 6b at a tension of 0.08 to 0.33/d, respectively.
In Fig. 3, the filaments are separated from each other on the surface of the oiling roller OR of the first finishing agent applying device 4-1, and the finishing agent is uniformly applied to each filament, and the finishing agent is applied to each filament uniformly. After that, a finishing agent is applied to the surface of the oiling roller OR2 while the filaments are concentrated.

Next, the yarn Y is processed by the entanglement processing device IL provided between the guide G and G2. The entanglement processing device has a main body 11, a puto P, and an entry guide G and G2 for reliably guiding the yarn to a predetermined position between the main body 11 and the plate P. Figures 3c and d are the entanglement processing device I.
In the partial enlarged view of L, c is a side view and d is a front view. As shown in these drawings, the fluid is injected in the direction of the arrow at an acute angle from two channels having a moderate intersecting angle, The fluid is received by the plate P, and the yarn is entangled by the jet flow. In the interlacing process, the angle 8 formed between the running direction of the yarn and the interlacing processing device IL is important. The range of 0 is preferably 5o to 15o.

When 0 is less than 50, variations in the degree of entanglement tend to become large, and when 8 is greater than 15o, damage to yarn fuzz, loops, etc. becomes a problem.

FIG. 4 shows an example in which the intertwined yarn is passed through a paper yarn cell 3 and then wound onto winding machines 6a and 6b without passing through godet rollers.

According to the method of the present invention, the distance between the spinneret surface and the first finishing agent applying device, which is the first support point of the spun yarn, is extremely short, so that the yarn sway during the yarn traveling process is minimized to an extremely small extent. Furthermore, since the threads are entangled and run in a state where they are concentrated after the interlacing device, they can run almost without being affected by disturbance airflow.

Next, the present invention will be explained by examples.

In the Examples, ○' switching success rate and ■ dyeing test yield have the following meanings. '1' Successful switching rate is calculated by subtracting the number of failed operations from the total number of times automatic switching operations were performed after full automatic detection and dividing the result by the total number of switching operations, expressed as a percentage.

■ Dyeing test yield All tubes are knitted from the surface of the rolled package (
1 sample (10 arcs), predetermined staining spots, dyeing with determination dye,
After washing with water and drying, visually judge the color difference from the standard sample.

The total number of samples with a color difference of 0 divided by the total number of samples evaluated and expressed as a percentage. Example 1 Polyethylene terephthalate with a chip relative viscosity of 1.380 (solvent: phenol:tetrachloroethane = 1:1, concentration 0.5 m/100 cc, measurement temperature 20 qC) was spun using the apparatus shown in Fig. 2. At a temperature of 280 qo, the discharge amount is 90 m/min from a mouthpiece with 30 holes.
2000 air was sprayed from the lateral direction of the yarn Y at a rate of 0.4 skin/sec from the spray device 2 having a spray zone length of 1.2 kites.

Next, a copolymer of ethylene oxide and propylene oxide (average molecular weight 1,600
) with a surface velocity of 8.
8/min, OR of the oil supply roller on the roller diameter 180 side,
and 0.1% after first finishing agent application treatment with OR2
A finishing agent was applied. The distance from the mouth surface of this device to the oil supply roller OR was 1.4 mm. Then, in the interlacing treatment IL, an average degree of entanglement of 2 particles/enemy was given by jet air of 3k9/c fin, and the material was passed through a spinning cell with an effective length of 3.5 kites in a focused state. Immediately after that, a 20% aqueous dispersion of the finishing agent is applied in the same manner as above using the second finishing agent applying device 4-2 to give a final adhesion amount of 0.4%, and a codet roller is used to apply the finishing agent at a constant speed of 3500 m/min. Take it up at a high speed, adjust the winding tension to 0.1 mm/d, and then
It was rolled up as a package of 3 m and a winding amount of 12k9. Approximately 10 tons were produced in this manner, and the operational stability and yarn quality performance were investigated. As a result, the birefringence index was 49×10-3, and the weave was 2.
34d/3, strength 580, elongation 124%, degree of entanglement 2
pieces/m, and the actual amount of finishing agent deposited was 0.4%. 12kg
When 830 rolled packages were collected, there were no twills or loops on the side of the package spool, and there were no other operational problems.

The production of 10 tons was carried out by automatic switching of 12k9 rolls, and the switching success rate was nearly 100%. This package has a yarn distance of 400 m/min, a twist number of 2500 T/, a spindle rotation speed of LOOOOOOOPM, and a stretching ratio of 16.
00, first heater temperature 205℃ (heater length 170c
m, contact type), second overfeed rate (feed rate before and after the second heater) 14%, second heater temperature 210q
Simultaneous stretching and false twisting was performed under the following conditions (heater length: 120 cm, non-contact type) to obtain a processed material of 3k9 rolls. As a result, the thread cutting rate was 0.001 pieces/10 items/hr. And fluff,
There are no external defects such as loops, and the dyeing test yield is 99.9.
%, which was extremely satisfactory. First for comparison
Polyethylene terephthalate having a chip viscosity similar to that described above was melt-spun using the conventional apparatus shown in the figure.

At this time, the spinning temperature, the number of holes in the spinneret, the discharge base, and the spraying conditions were the same as those described above. The yarn blown with cooling air is passed through a spinning cell 3 with a length of 3.5 mm, and then a finishing agent 4 (a roller with a diameter of 18 mm) is used to disperse the same finishing agent in 12% water as described above. A liquid was applied to give a coating weight of 0.4%, and a package with a winding amount of 12k9 was wound up. Ten tosos were produced in this way, and the operational stability and yarn quality performance were investigated. As a result, we first found that tension had a significant effect on the winding shape of the package.

The one with a winding tension of 0.1/d had a relatively good winding appearance, but even in the package that was thought to be the best, there were quite a few twills and loops on the side end faces, which is also favorable in terms of appearance. It wasn't something.

When this yarn was subjected to simultaneous stretching and pre-stretching under the above conditions, yarn breakage occurred frequently (2 to 3 pieces/10 hr.), which seemed to cause problems in the winding appearance of the package. The texture was extremely poor, and the resulting processed yarn had a lot of fuzz, and furthermore, the dyeing test yield was less than 80%, giving extremely unsatisfactory results. Example 2 Using the apparatus shown in Figure 4, the relative viscosity of the chip was 1.380.
Spinning polyethylene terephthalate at a temperature of 28,000, the number of holes is 36 x 2, and the discharge amount is 86 skins /
Two threads are discharged at a rate of
of air was blown at a rate of 0.2/sec.

Next, an aqueous dispersion of the same finishing agent as in Example 1 was prepared at a surface speed of 8.
．． 8 skins/min, oil supply roller OR with 18 rollers,
Then, a first finishing agent treatment is performed with OR2 to give each yarn a 0.0% finish.
A 12% finish was applied. The distance from the mouth surface of this device to the oil supply roller OR was 90 mm. Next, each yarn is given an average degree of entanglement of 2.5 pieces/skin by interlacing treatment IL2.0k9/enemy jet air to give an effective length of 3.
The yarn was passed through the 5-skin weaving cell 3 in a focused state. Immediately below this, a 20% aqueous dispersion of a finishing agent similar to the first finishing agent is applied by the finishing agent applying device 4-2, so that the final coating weight of the yarn is 0.5.
%, and 0.1 at 3300/min using winders 6a and 6b without using godet rollers.
The film was wound with a winding tension of 8 mm/d. In this way, about 3 tons of yarn with 11 spots/3 matrices and a winding amount of 12k9 were produced. The performance of the yarn is birefringence 50×10-3, weave 11/36
f, elongation of 120%, degree of entanglement of 2.5 particles/skin, and amount of deposited finishing agent of 0.45%.

When I collected 12k9 volumes and 25 solid packages,
There were no slippages or loops on the side of the package spool, and there were no other operational problems.

This package has a yarn distance of 285 m/min and a twist count of 3508.
T/m, spindle rotation speed 100000pm, stretching ratio 1620, first heater temperature 200oo (heater length 170 arc, contact type), second overfeed rate 14%
Simultaneous stretching and false twisting was performed at a second heater temperature of 210° C. (heater length: 120 arcs, non-contact type) to obtain a 3 kg wound yarn.

As a result, the thread breakage rate increased by 0.08 pieces/10 hours.
There were no defects in appearance such as fluff or loops, and the dyeing test yield was 99.5%. For comparison, paper yarn was wound under the same conditions as in Example 2 using a device in which the distance from the mouthpiece surface to the winding machine was shortened except for the paper yarn cell 3 in FIG. I collected the solid package. Next, drawing pre-combustion processing was performed under the same conditions as in Example 2. Although the spinning operability and package appearance were good, the yarn breakage rate during drawing false twisting was 0.12 pieces/1 billion threads/hr.
The dyeing test yield of the processed yarn was 94.0%.

No particular defects were observed in the appearance of the processed yarn, but when jersey was knitted using this processed yarn, weft steps were observed in the product, and it was found that there were irregularities that were not visible on surface inspection. It was.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of an apparatus for performing a conventional method, Fig. 2 is a schematic side view showing an embodiment of the present invention, and Fig. 3 is a schematic side view of an apparatus for performing a conventional method.
FIG. 4 is a partially enlarged view of the figure and a schematic side view showing another embodiment. 1...cap, 2...spraying device, 3...
Spinning cell, 4, 4-1, 4-2...Finishing agent applying device, O
R,,OR2...Oil supply roller, 5a, 5b...
... Godet roller, 6a, 6b ... Winding machine,
G, G, G2...guide, IL...entanglement processing device, Y...
...Thread. Tsuyoshi 3 figures Ito 2 figures Tsutomu 4 figures

Claims (1)

[Claims] 1. Spinning polyester or polyamide at a speed of 1600 m
When melt-spinning at a high speed of /min or more, the distance from the spinneret surface to the yarn melt-spun from the spinneret is such that the filaments constituting the yarn do not fuse to each other at the initial support point. Applying a finishing agent of 0.1 to 0.2% based on the weight of the fibers by a first finishing agent applying device installed in a range larger than a sufficient minimum distance and within 3 m,
Next, an entanglement device using a gas flow provided directly below the fibers is used to provide entanglement with a degree of entanglement of 1 to 10 pieces/m, and after passing through a spinning cell, a finishing agent is further applied using a second finishing agent applying device. A melt spinning method characterized in that the final coating amount of finishing agent is 0.3 to 0.5% and winding is carried out into a package at a winding tension of 0.08 to 0.33 g/d. 2. The first finishing agent applicator consists of two rollers, and
A focusing guide is provided between the two rollers, and the finish is applied to the surface of the first roller with the filaments separated, and the finish is applied to the surface of the second roller while the filaments are focused. A method according to claim 1. 3. The method according to claim 1, wherein the winding tension is 0.08 to 0.21 g/d. 4. The method according to claim 1, wherein after applying the finishing agent by the second finishing agent applying device, the package is wound into a package without passing through a godet roller.